ConvaTec SUR-FIT Natura - Stomahesive Moldable Skin Barrier w/Flange (Hydrocolloidal Collar) is ideal for those whose stoma output is semi-formed to formed. The coupling ring allows the pouch and skin barrier wafer to snap together for a secure, confident fit. Designed to fit a variety of stoma sizes and shapes, this ostomy wafer minimizes leaks helping to protect peristomal skin. To use, simply mold around the stoma. There is no need to cut or measure the wafer.